Radeon DRM kmod problem after LLVM upgrade!?

This afternoon after upgrading llvm15 from 15.0.7_5 to 15.0.7_7, Xorg
no longer runs properly -- if I use drm-510-kmod instead of VESA.

My display card is Raven Ridge [Radeon Vega Series / Radeon Vega Mobile
Series] (USB id vendor=0x1002 device=0x15dd).

When I boot in single-user mode, load the amdgpu.ko module from
graphics/drm-510-kmod, and attempt to start Xorg, I get a pretty
pattern of dots all over the screen, and Xorg reports (on the console):

ac_rtld error: !data || data->d_size != shdr->sh_size
LLVM failed to upload shader
ac_rtld error: !data || data->d_size != shdr->sh_size
LLVM failed to upload shader
EE ../src/gallium/drivers/radeonsi/si_state_shaders.cpp:2505 
si_build_shader_variant - Failed to build shader variant (type=0)
ac_rtld error: !data || data->d_size != shdr->sh_size
LLVM failed to upload shader
EE ../src/gallium/drivers/radeonsi/si_state_shaders.cpp:2505 
si_build_shader_variant - Failed to build shader variant (type=0)
ac_rtld error: !data || data->d_size != shdr->sh_size
LLVM failed to upload shader
EE ../src/gallium/drivers/radeonsi/si_state_shaders.cpp:2505 
si_build_shader_variant - Failed to build shader variant (type=0)
ac_rtld error: !data || data->d_size != shdr->sh_size
LLVM failed to upload shader
EE ../src/gallium/drivers/radeonsi/si_state_shaders.cpp:2505 
si_build_shader_variant - Failed to build shader variant (type=0)
ac_rtld error: !data || data->d_size != shdr->sh_size
LLVM failed to upload shader
EE ../src/gallium/drivers/radeonsi/si_state_shaders.cpp:2505 
si_build_shader_variant - Failed to build shader variant (type=0)

Everything is fine if I use VESA mode, thankfully.

My system has never been completely trouble-free with amd-510-kmod,
but it has so far worked wonderfully well when it doesn't crash.  But
how that driver could interact with LLVM is beyond me.  Should I try
simply recompiling the module with the latest LLVM?       -- George